It comes down to how you interpret the sanctity of life, and your worldview usually governs that. A materialistic worldview, which denies any and all spirituali

It comes down to how you interpret the sanctity of life, and your worldview usually governs that. A materialistic worldview, which denies any and all spirituality, is likely to take a purely scientific stance and assert a fetus is not human. Meanwhile, worldviews that see procreation as a gift from a higher power will naturally push back against that assertion. The only common ground that seems to be available between these two camps is in extreme cases (i.e., the mother's life is at risk or rape). Otherwise, I think they are fundamentally incompatible.